#!/usr/bin/env python
#-*- coding:utf-8 -*-

a1=[1,3,4,4.5]
a1.insert(2,'aaa')
print a1

a1.append(6)
print a1

a2=[11,22,'bb']
a1.append(a2)
print a1

print len(a1)

a1_len=len(a1)
print "a1 last element:"
print a1[a1_len-1]
print "a1 last last element:"
print a1[a1_len-1][2]
